24. Ribosomes are composed of: a. Proteins b. Lipids c....

24. Ribosomes are composed of: a. Proteins b. Lipids c. RNA d. A and C 25. Which is a key part of the endomembrane system which acts as a "shipping" factory? a. Golgi Apparatus b. Mitochondrion c. Chloroplast d. Ribosome 26. Which type of lipid is most common in biological membranes? a. Fats. b. Oils. c. Phospholipids. d. Triglycerides. 27. The role of gap junctions in animal tissues is: a. Keep neighboring cells attached together b. Prevent leakage of materials between cells c. Allow communication between cells d. All of the above.

Transcript

00:01 Hello everyone.

00:02 Today we're going to solve the given multiple choice questions.

00:06 First one is ribosomes are composed of what? we know that ribosome having two subunits, larger or smaller, has the composition of 50 % proteins and 50 % of ribosomal rna.

00:36 So they are the ribonuclear protein particles.

00:39 So ribosomes are composed of both proteins and liquids, sorry, proteins and rna.

00:46 Both a and c will be the correct option, which is a key part of endom membrane system that acts as shipping factory.

00:55 We know that here we have the endoplasmic reticulum, endoplasmic reticulum, and it is rough endoplasmic reticulum having large number of ribosomes over it.

01:11 Proteins formed on rough endoplasmic tritulum are expelled in the form of small vesicles.

01:23 Now these are the vesicles containing proteins in it.

01:28 These vesicles further join and other organelle that is a part of end membrane system and becomes a part of it.

01:47 This organelle is called golgi apparatus.

02:00 Now, after further processing or post -translational modifications, these protein vesicles are expanded out from the opposite end of the golgi vesicles.

02:28 So the protein vesicles shipping from rough endoplasmic reticulum to the cytoplasm is performed by golgi appetis, so -called epitus, is the shipping factory of the cell.

02:45 Which type of lipid is most common in biological membranes? we know that the structure of biological membrane is looking like this...

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